EP0443488A1 - Verfahren zur Herstellung eines oxidischen Supraleiters - Google Patents

Verfahren zur Herstellung eines oxidischen Supraleiters Download PDF

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Publication number
EP0443488A1
EP0443488A1 EP91102271A EP91102271A EP0443488A1 EP 0443488 A1 EP0443488 A1 EP 0443488A1 EP 91102271 A EP91102271 A EP 91102271A EP 91102271 A EP91102271 A EP 91102271A EP 0443488 A1 EP0443488 A1 EP 0443488A1
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EP
European Patent Office
Prior art keywords
oxide superconductor
samples
production method
chemical composition
ba2cu4o8
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91102271A
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English (en)
French (fr)
Other versions
EP0443488B1 (de
Inventor
Takahiro Wada
Nubuo Suzuki
Ataru Ichinose
Yuji Yaegashi
Hisao Yamauchi
Shoji Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Research Institute of Electric Power Industry
Tohoku Electric Power Co Inc
International Superconductivity Technology Center
Panasonic Holdings Corp
Tokyo Electric Power Co Holdings Inc
Original Assignee
Central Research Institute of Electric Power Industry
Tohoku Electric Power Co Inc
Tokyo Electric Power Co Inc
International Superconductivity Technology Center
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central Research Institute of Electric Power Industry, Tohoku Electric Power Co Inc, Tokyo Electric Power Co Inc, International Superconductivity Technology Center, Matsushita Electric Industrial Co Ltd filed Critical Central Research Institute of Electric Power Industry
Publication of EP0443488A1 publication Critical patent/EP0443488A1/de
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Publication of EP0443488B1 publication Critical patent/EP0443488B1/de
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
    • C04B35/4504—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing rare earth oxides
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0268—Manufacture or treatment of devices comprising copper oxide
    • H10N60/0296—Processes for depositing or forming copper oxide superconductor layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/80—Constructional details
    • H10N60/85—Superconducting active materials
    • H10N60/855—Ceramic superconductors
    • H10N60/857—Ceramic superconductors comprising copper oxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/775—High tc, above 30 k, superconducting material
    • Y10S505/776—Containing transition metal oxide with rare earth or alkaline earth
    • Y10S505/779—Other rare earth, i.e. Sc,Y,Ce,Pr,Nd,Pm,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and alkaline earth, i.e. Ca,Sr,Ba,Ra
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/775—High tc, above 30 k, superconducting material
    • Y10S505/776—Containing transition metal oxide with rare earth or alkaline earth
    • Y10S505/779—Other rare earth, i.e. Sc,Y,Ce,Pr,Nd,Pm,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and alkaline earth, i.e. Ca,Sr,Ba,Ra
    • Y10S505/78—Yttrium and barium-, e.g. YBa2Cu307

Definitions

  • This invention relates to a method for producing oxide superconductors, and more particularly to a method for producing oxide superconductors, the superconductivity transition temperature (hereafter referred to as Tc) of which is higher than the boiling point of liquid nitrogen (absolute temperature 77K).
  • Tc superconductivity transition temperature
  • the oxide superconductor (Y,Ca)Ba2Cu4O8, in which Ca has been substituted for a part of Y mentioned above, is conventionally produced by the following process. Material powders of the constituent elements are blended to have a predetermined element ratio, and the mixture is calcined and is subjected to a hot static pressing process for about ten hours in a mixed atmosphere of oxygen gas (20%) and argon gas (80%) at 2000 atm. Almost the same process was applied to the oxide superconductor containing Sr substituted for a part of Ba.
  • the production method of the present invention for an oxide superconductor which is expressed by a chemical composition formula (R 1-x Ca x ) (Ba 1-y Sr y )2Cu4O8 is characterized most importantly by the step of causing an interaction between a material expressed by (R 1-x Ca x ) (Ba 1-y Sr y )2Cu3O 7-z and a Cu material.
  • the above-mentioned Cu material may consist of CuO. It ought to be noted that in the composition formula, R stands for one or more than one kind of rare earth elements selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb, x is in the range from 0.001 to 0.25, y is in the range from 0 to 0.5, and z is in the range from 0 to 1.
  • oxide superconductors which are expressed by the chemical composition formula (R 1-x Ca x )(Ba 1-y Sr y )2Cu4O8, can be produced at low cost.
  • thermogravimetric analysis it was confirmed that the oxide superconductor of this invention exists stably with no absorption or discharge of oxygen up to about 900°C.
  • oxide superconductors according to this invention do not impair their superconductivity through a sintering process in the final stage of the manufacturing process for a silver sheathed wire. For this reason, the superconductor made by this production method enables to produce a superconducting wire which is stable in superconductivity and which is sintered in high density.
  • Fig. 1 shows a basic structure of RBa2Cu4O8, which is the main component of an oxide superconductor according to this invention.
  • reference numeral 1 indicates a rare earth element R
  • 2 indicates Ba
  • 3 indicates Cu
  • 4 indicates O located at inter-sections of line segments.
  • An oxide superconductor of (R 1-x Ca x )Ba2Cu4O8 system according to this invention is a compound derived from this basic structure by substituting Ca for at least a part of Y in this crystal structure having double CuO chains.
  • (R 1-x Ca x ) (Ba 1-y Sr y )2Cu4O8 is a compound obtained by further substituting Sr for a part of Ba in this structure.
  • Each of the mixtures was calcined in an atmosphere of oxygen for ten hours at 900°C and 920°C. After calcination, a sample of the mixture was crushed and subjected to powder X-ray diffraction analysis. As a result, it was confirmed that (Y 1-x Ca x )Ba2Cu3O 7-z of substantially single phase was obtained in which 0 ⁇ z ⁇ 1.
  • the Tc in Table 1 is the temperature when the resistivity is 0, obtained from the resistance - temperature characteristics.
  • each of oxide superconductor samples of a chemical composition of (Y 1-x Ca x )Ba2Cu4O8, made by the production method according to the first embodiment of this invention exhibits 90K-class superconductivity transition temperature. This superconductivity transition temperature is higher than the boiling point of liquid nitrogen (77K).
  • TG(%) indicates the result of thermogravimetric analysis
  • DTA( ⁇ V) indicates the result of differential thermal analysis.
  • measurements were performed while the samples were heated.
  • the samples did not show changes in weight from normal temperature up to the neighborhood of 900°C, but decreased in weight at 900°C. It was ascertained from these findings that the superconductivity exist in stable state without absorption or discharge of oxygen until the samples are heated to a high temperature as high as 900°C.
  • Powder X-ray diffraction analysis was performed on the sintered sample of a chemical composition formula (Y 0.9 Ca 0.1 )Ba2Cu4O8 to determine its crystal phase, and it was revealed that an intended phase with a crystal structure of YB2Cu4O8 type was not formed at all.
  • Oxide superconductors produced by the methods according to the first to fifth embodiments of this invention have Tc higher than the boiling point of liquid nitrogen, and when made into silver sheathing wires, do not have their superconductivity lessened by the sintering process. Therefore, a superconducting wire stable in superconductivity can be produced relatively easily.
  • oxide superconductors made by the production methods according to the first to fifth embodiments can be formed into high-density products if a binder is used in high-temperature forming. From conventional oxide superconductors expressed by a chemical composition formula RBa2Cu3O7, the binder cannot be removed at 400°C or higher. On the other hand, from oxide superconductors made by the production methods according to the first to fifth embodiments, the binder can be removed at 900°C or below, a fact which permits high-density forming, and improves a superconducting current density.
  • oxide superconductors at low cost, which have a superconductivity transition temperature higher than the boiling point of liquid nitrogen expressed by a chemical composition formula (R 1-x Ca x )(Ba 1-y Sr y )2Cu4O8 (R stands for a one or two or more kinds of rare earth elements selected from among Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) and which is stable with no absorption or discharge of oxygen up to high temperature.
  • R stands for a one or two or more kinds of rare earth elements selected from among Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm
  • this invention can be used for low-temperature electronic apparatuses and their wiring or for electromagnetic shielding, etc.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP91102271A 1990-02-19 1991-02-18 Verfahren zur Herstellung eines oxidischen Supraleiters Expired - Lifetime EP0443488B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2038085A JP2636057B2 (ja) 1990-02-19 1990-02-19 酸化物超電導体の製造方法
JP38085/90 1990-02-19

Publications (2)

Publication Number Publication Date
EP0443488A1 true EP0443488A1 (de) 1991-08-28
EP0443488B1 EP0443488B1 (de) 1995-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102271A Expired - Lifetime EP0443488B1 (de) 1990-02-19 1991-02-18 Verfahren zur Herstellung eines oxidischen Supraleiters

Country Status (4)

Country Link
US (1) US5149683A (de)
EP (1) EP0443488B1 (de)
JP (1) JP2636057B2 (de)
DE (1) DE69110495T2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270295A (en) * 1991-01-18 1993-12-14 Industrial Technology Research Institute Process for preparing superconductors and compositions useful therein
DE69224605T2 (de) * 1991-11-28 1998-11-05 Int Superconductivity Tech Kupferoxid-Supraleiter, Verfahren zu seiner Herstellung und dabei verwendete Kupferverbindung
US5683969A (en) * 1992-05-12 1997-11-04 American Superconductor Corporation Strongly-linked oxide superconductor and a method of its manufacture
US5846912A (en) * 1996-01-04 1998-12-08 Lockheed Martin Energy Systems, Inc. Method for preparation of textured YBa2 Cu3 Ox superconductor
AUPO902797A0 (en) * 1997-09-05 1997-10-02 Cortronix Pty Ltd A rotary blood pump with hydrodynamically suspended impeller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005604A1 (en) * 1987-01-27 1988-07-28 Japan As Represented By Director General Of Agency Superconductors and method for manufacturing thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005604A1 (en) * 1987-01-27 1988-07-28 Japan As Represented By Director General Of Agency Superconductors and method for manufacturing thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PHYSICA C. vol. 165, no. 5/6, 15 February 1990, AMSTERDAM NL pages 391 - 396; R.G.Buckley et al.: "Calcium-Substituted Superconducting RBa2Cu4O8 with Tc=90K Prepared at OneAtmosphere" *
PHYSICA C. vol. 165, no. 5/6, 15 February 1990, AMSTERDAM NL pages 415 - 418; S.Jin et al.: "Synthesis and Properties of the YBa2Cu4O8 Superconductor" *

Also Published As

Publication number Publication date
JP2636057B2 (ja) 1997-07-30
DE69110495D1 (de) 1995-07-27
DE69110495T2 (de) 1996-02-22
JPH03242322A (ja) 1991-10-29
EP0443488B1 (de) 1995-06-21
US5149683A (en) 1992-09-22

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